杂质对过氧化苯甲酰的热分解危险性研究

Risk of impurities on thermal decomposition of benzoyl peroxide

为了解过氧化苯甲酰(BPO)在不同情形下的热分解危险性,利用差示扫描量热仪(DSC)研究BPO在不同升温速率下的热分解情况以及不同杂质对BPO的热分解影响,采用Kissinger法以及Ozawa法计算其表观活化能,从不同角度分析BPO分解放热过程的特点和危险性。从初始分解温度角度,t_0(C_7H_8)<t_0(H_2O)<t_0(BPO)<t_0(NaOH),加入适量甲苯比水更能促进BPO的分解,而氢氧化钠的存在则会起到一定的抑制作用;从反应热的角度,ΔH(H_2O)<ΔH(C_7H_8)<ΔH(BPO)<ΔH(NaOH),表明水和甲苯会使体系放出的热量减小,而氢氧化钠的加入会使其显著增大;从动力学参数角度,相同条件下,E(C_7H_8)<E(BPO)<E(NaOH)<E(H_2O),说明适量甲苯的存在会增加BPO的分解速率,而氢氧化钠和水的存在会降低BPO的分解速率。

In order to investigate the thermal decomposition of benzoyl peroxide （BPO） under different conditions, several thermal decomposition experiments at different heating rates and with different impurities were performed by differential scanning calorimetry （DSC）. The apparent activation energy was calculated by Kissinger and Ozawa method to assess the characteristics and risks of the exothermic decomposition process of BPO. As the experimental results, the temperature of initial decomposition varies as to （ C7 H8 ） 〈 to （ H2 O） 〈 to （BPO） 〈 to （ NaOH）, meaning that proper amount of toluene can promote the decomposition of BPO better than water, but the sodium hydroxide can be as an inhibitor. The reaction heat of decomposition differs as △H（H2O）〈△H（C7H8）〈△H（BPO）〈△H（NaOH） , indicating that the water and toluene can reduce the amount of heat released by the system, while the addition of sodium hydroxide can make it significantly increased. From the viewpoint of kinetic parameters, E（C7H8） 〈 E （BPO） 〈 E （NaOH） 〈 E （ H2O）, toluene can increase the decomposition rate of BPO, but the sodium hydroxide and water are negative.